Self-balancing eccentric shaft

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By dividing the eccentric shaft into a rotor shaft and an eccentric shaft head, and by using counterweights and interference fits, the problem of unstable rotation of the eccentric shaft was solved, achieving higher rotational stability and reducing costs.

CN224533235UActive Publication Date: 2026-07-21SHANGHAI BOBANG AUTOMOTIVE TECH CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: SHANGHAI BOBANG AUTOMOTIVE TECH CO LTD
Filing Date: 2025-07-16
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

The center of gravity of the existing eccentric shaft is located outside the axis of rotation, resulting in unstable rotation.

Method used

Design a self-balancing eccentric shaft, which is divided into a rotor shaft and an eccentric shaft head. By cooperating with the counterweight and the shaft head rod, the center of gravity is located on the central axis of the rotor shaft. The structure is optimized by interference fit and weight reduction holes to ensure stability.

Benefits of technology

It improves the rotational stability of the eccentric shaft, reduces manufacturing and maintenance costs, and enables separate machining and easy replacement.

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Abstract

The utility model relates to a kind of self-balancing eccentric shaft, including rotor shaft and the eccentric shaft head installed in one end of rotor shaft;Wherein, the eccentric shaft head is eccentrically connected with the shaft head rod to the end of the rotor shaft connected with the back;The eccentric shaft head is connected with counterweight to the end of the rotor shaft connected with the back away from the shaft head rod side eccentrically;By the counterweight and the shaft head rod cooperation, so that the overall gravity center of the eccentric shaft head is located on the extension line of the rotor shaft central axis;The eccentric shaft is set to rotor shaft and eccentric shaft head two parts in the application, wherein eccentric shaft head provides the output shaft head rod, and the gravity change brought by shaft head rod is neutralized by counterweight, so that its gravity falls on the central axis of rotor shaft, the stability of rotor shaft when eccentric shaft is used can be improved, and the stability of overall rotation is further guaranteed.

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Description

Technical Field

[0001] This utility model relates to the field of eccentric shaft technology, and specifically to a self-balancing eccentric shaft. Background Technology

[0002] A workpiece whose outer circle is parallel to but does not coincide with the axis of the outer circle is called an eccentric shaft. Eccentric shafts are generally fixed to the rotating shaft of a motor through an eccentric hole, and perform cam motion when the motor starts. Therefore, they are widely used in automobiles, engines, pumps, etc.

[0003] Because of the eccentricity of its two connecting ends, the center of gravity of an eccentric shaft is not located on the rotation axis of either connecting end. In actual use, the center of gravity will inevitably be located outside the rotation center, which poses a hidden danger and risk of rotational instability. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a self-balancing eccentric shaft to solve the problem of rotational instability caused by the center of the eccentric shaft being located outside the axis of rotation in the prior art.

[0005] To achieve the above objectives, this utility model provides a self-balancing eccentric shaft, including a rotor shaft and an eccentric shaft head mounted at one end of the rotor shaft; wherein,

[0006] The eccentric shaft head is eccentrically connected to a shaft head rod at one end opposite to the rotor shaft;

[0007] A counterweight is connected to the side of the eccentric shaft head that is opposite to the rotor shaft and away from the side of the shaft head rod that is eccentrically connected to it.

[0008] By cooperating with the counterweight and the shaft head rod, the overall center of gravity of the eccentric shaft head is located on the extension line of the central axis of the rotor shaft.

[0009] By adopting this technical solution, the eccentric shaft is set up as two parts: a rotor shaft and an eccentric shaft head. The eccentric shaft head provides the output shaft head rod, and the center of gravity change caused by the setting of the shaft head rod is neutralized by the counterweight block, so that its center of gravity falls on the central axis of the rotor shaft. This can improve the stability of the rotor shaft when the eccentric shaft is used, thereby ensuring the overall rotational stability.

[0010] Furthermore, the end of the rotor shaft facing the eccentric shaft head has a connecting end, and the end of the eccentric shaft head facing the rotor shaft has a mounting hole;

[0011] The connecting end and the mounting hole are interference-fitted, and the rotor shaft and the eccentric shaft head are fixedly connected by the interference fit between the connecting end and the mounting hole.

[0012] By adopting this technical solution, the interference fit between the connecting end and the mounting hole can solidify the rotor shaft and the eccentric shaft head into one unit, ensuring the stability of subsequent use. At the same time, it can also realize the separate processing of the rotor shaft and the eccentric shaft head before assembly, which can reduce the manufacturing difficulty.

[0013] Furthermore, the counterweight is integrally connected to the outer wall of the eccentric shaft head.

[0014] By adopting this technical solution, it is possible to ensure that the counterweight can change the position of the center of gravity while avoiding the counterweight affecting the connection of the shaft head rod.

[0015] Furthermore, the eccentric shaft head has a weight-reducing hole along a direction parallel to the axial direction.

[0016] By adopting this technical solution, the center of gravity of the eccentric shaft head can be ensured to fall on the extension line of the rotor shaft's central axis by opening weight reduction holes in conjunction with the counterweight and shaft head rod. At the same time, the weight of the eccentric shaft head can be reduced, thereby reducing the overall manufacturing cost.

[0017] Furthermore, the outer wall surface of the rotor shaft is provided with uniformly distributed friction-enhancing grooves that are parallel to the axial direction along the circumferential direction.

[0018] By adopting this technical solution, increased friction can prevent slippage and provide a position for applying force, reducing the difficulty of connecting the rotor shaft and the eccentric shaft head.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] 1. The eccentric shaft is configured as two parts: the rotor shaft and the eccentric shaft head. The eccentric shaft head provides the output shaft head rod, and the center of gravity change caused by the shaft head rod is neutralized by the counterweight block, so that the center of gravity falls on the central axis of the rotor shaft. This can improve the stability of the rotor shaft when the eccentric shaft is used, thereby ensuring the overall rotational stability.

[0021] 2. The rotor shaft and eccentric shaft head are connected by an interference fit, which can be processed separately during manufacturing and can be replaced as needed during maintenance, thus reducing manufacturing and maintenance costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional exploded view of the self-balancing eccentric shaft of this utility model;

[0023] Figure 2 This is a three-dimensional schematic diagram of the self-balancing eccentric shaft of this utility model;

[0024] Figure 3 This is a top view schematic diagram of the self-balancing eccentric shaft of this utility model;

[0025] Figure 4 for Figure 3 Schematic diagram of cross-section along the YY direction.

[0026] Explanation of reference numerals in the attached drawings: 1. Rotor shaft; 11. Connecting end; 2. Eccentric shaft head; 21. Shaft head rod; 22. Mounting hole; 23. Counterweight. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Please see the appendix Figure 1-2 This utility model provides a self-balancing eccentric shaft, including a rotor shaft 1 and an eccentric shaft head 2 installed at one end of the rotor shaft 1; wherein, the end of the eccentric shaft head 2 facing away from the rotor shaft 1 is eccentrically connected to a shaft head rod 21; a counterweight block 23 is connected to the side of the eccentric shaft head 2 facing away from the rotor shaft 1 and away from the eccentric connection shaft head rod 21; through the cooperation of the counterweight block 23 and the shaft head rod 21, the overall center of gravity of the eccentric shaft head 2 is located on the extension line of the central axis of the rotor shaft 1;

[0029] The eccentric shaft is configured as two parts: rotor shaft 1 and eccentric shaft head 2. The eccentric shaft head 2 provides the output shaft head rod 21, and the center of gravity change caused by the shaft head rod 21 is neutralized by the counterweight block 23, so that its center of gravity falls on the central axis of rotor shaft 1. This can improve the stability of rotor shaft 1 when the eccentric shaft is used, thereby ensuring the overall rotational stability.

[0030] Please see the appendix Figure 1 and 4 The rotor shaft 1 has a connecting end 11 at the end facing the eccentric shaft head 2, and the eccentric shaft head 2 has a mounting hole 22 at the end facing the rotor shaft 1; the connecting end 11 and the mounting hole 22 are interference-fitted, and the rotor shaft 1 and the eccentric shaft head 2 are fixedly connected by the interference fit between the connecting end 11 and the mounting hole 22.

[0031] The interference fit between the connecting end 11 and the mounting hole 22 enables the rotor shaft 1 and the eccentric shaft head 2 to be fixed together as one unit to ensure the stability of subsequent use. At the same time, it also allows the rotor shaft 1 and the eccentric shaft head 2 to be processed separately before assembly, which can reduce the manufacturing difficulty.

[0032] Please see the appendix Figure 3-4 The counterweight 23 is integrally connected to the outer wall of the eccentric shaft head 2; this ensures that the counterweight 23 can change the position of the center of gravity while avoiding the counterweight 23 affecting the connection of the shaft head rod 21.

[0033] Please see the appendix Figure 3-4The eccentric shaft head 2 has a weight reduction hole along a direction parallel to the axial direction. By opening the weight reduction hole, the counterweight block 23 and the shaft head rod 21 can be used to ensure that the center of gravity of the eccentric shaft head 2 can fall on the extension line of the central axis of the rotor shaft 1, and at the same time, the weight of the eccentric shaft head 2 can be reduced, thus reducing the overall manufacturing cost.

[0034] Please see the appendix Figure 1-2 The outer wall surface of the rotor shaft 1 is provided with uniformly distributed friction-enhancing grooves parallel to the axial direction along the circumferential direction; the increased friction can prevent slippage and provide a position for applying force, reducing the difficulty of connecting the rotor shaft 1 and the eccentric shaft head 2.

[0035] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A self-balancing eccentric shaft, characterized in that, Includes a rotor shaft and an eccentric shaft head mounted at one end of the rotor shaft; wherein, The eccentric shaft head is eccentrically connected to a shaft head rod at one end opposite to the rotor shaft; A counterweight is connected to the side of the eccentric shaft head that is opposite to the rotor shaft and away from the side of the shaft head rod that is eccentrically connected to it. By cooperating with the counterweight and the shaft head rod, the overall center of gravity of the eccentric shaft head is located on the extension line of the central axis of the rotor shaft.

2. The self-balancing eccentric shaft according to claim 1, characterized in that: The end of the rotor shaft facing the eccentric shaft head has a connecting end, and the end of the eccentric shaft head facing the rotor shaft has a mounting hole; The connecting end and the mounting hole are interference-fitted, and the rotor shaft and the eccentric shaft head are fixedly connected by the interference fit between the connecting end and the mounting hole.

3. The self-balancing eccentric shaft according to claim 1, characterized in that: The counterweight is integrally connected to the outer wall of the eccentric shaft head.

4. The self-balancing eccentric shaft according to claim 1, characterized in that: The eccentric shaft head has a weight reduction hole along a direction parallel to the axial direction.

5. The self-balancing eccentric shaft according to claim 1, characterized in that: The outer wall surface of the rotor shaft is provided with uniformly distributed friction-enhancing grooves that are parallel to the axial direction.